Proximity Sensors and Android Classes

The MotionEvent.ACTION_DOWN action signals the beginning of a touch event. It records the initial touch coordinates (x,y) on the device's screen.

The MotionEvent.ACTION_MOVE action tracks the touch as it moves across the screen. It continually records the touch coordinates (x,y) as the finger moves.

The MotionEvent.ACTION_UP action marks the end of the touch event, recording the final touch coordinates (x,y) on the screen.

A sensor type used to measure acceleration forces applied to the device along its three axes (x, y, and z)

A sensor type used to measure the rate of rotation around the device's three axes (x, y, and z)

A sensor type used to measure the level of ambient light in lux (a unit of illuminance)

A sensor type used to measure the ambient air temperature around the device

A sensor type used to measure air pressure, typically utilized for altitude measurements

A type of sensor that determines the distance of an object from the device It detects the presence of nearby objects without physical contact.

A type of sensor that measures the strength of a magnetic field along three axes (x, y, z).

A framework class in Android that provides access to device sensors. It allows you to register and unregister sensor event listeners. It also provides constants for sensor accuracy and data acquisition rates.

A framework class in Android that represents a specific sensor and its characteristics. It provides information about the sensor's name, type, range, resolution, and power consumption.

A framework class in Android that provides data from sensors when an event occurs. It contains information about the sensor generating the event, the captured data, the accuracy of the data, and the timestamp of the event.

Permissions that require explicit user approval before being granted to an app.

Permissions that are automatically granted to an app when installed.

Storing data on the user's device. This data is only accessible by the app itself and requires no internet connection.

Storing data on a remote server, accessible from anywhere with an internet connection.

A storage method that allows sharing data between different Android applications.

A lightweight storage method for storing simple key-value pairs.

A powerful database system for storing structured data on a local device.

A mechanism allowing different Android apps to access, modify, and delete data in another application.

ContentProviders enforce security rules, allowing you to control who can access what data.

ContentProviders abstract the underlying data storage method, meaning apps don't need to know how data is stored (e.g., SQLite, files).

A standard web-like address used to access specific data resources within a ContentProvider.

They grant or deny read or write permissions for specific sections of your app's data.

ContentProviders utilize cursors to efficiently manage and navigate large datasets.

ContentProviders notify apps whenever data changes, enabling dynamic updates.

Android provides built-in ContentProviders for accessing common system-level data.

A temporary storage mechanism within an Android application instance, allowing data to be saved and restored when the application is interrupted or restarted. It's primarily used for retaining UI state or temporary data that doesn't require permanent storage.

A specialized data structure used by Android to pass information between application components, such as activities or fragments.

A method called by the Android system to save data associated with an activity before it's destroyed or paused. This allows the activity to restore its state when it's recreated later.

A method called by the Android system to restore the saved state of an activity when it's recreated after being destroyed or paused.

A method called by the Android system when an activity is about to be sent to the background. This is a suitable time to save data to SharedPreferences as the application will be inactive for a while.

A method called by the Android system when an activity is created or restarted. You can restore saved data from SharedPreferences here, allowing the activity to start with its previous state.

Preferences that are saved for the entire application and are accessible to all activities within the app.

Preferences that are tied to a specific activity and only available within that activity.

A function that retrieves and sets the value of a key-value pair.

A method used to save preferences and requires a call to either 'commit()' or 'apply()' to save the values to memory.

A function that saves edited preference values to memory.

A method used to retrieve a specific value from the SharedPreferences.